Sunday, September 06, 2009

Wooden shipping pallets are easily recycled into large, heavy-duty compost bins. Pallets are available for free from many area businesses, assemble in minutes, and with them you can produce rich humus, mulch and compost year after year. Here's how:

A Simple Pallet Bin

Obtain five pallets with narrow spaces between slats (1/2" - 1") and of uniform size. Many pallets measure 40" by 48" and will form a 48 cubic foot capacity bin. Pick up pallets from loading docks, freight companies, hardware stores, product wholesalers, nurseries and garden centers. Each year, American businesses send more than 300 million pallets to landfills and incinerators -- there are always plenty around for free. Good places to check are print shops, tire wholesalers, even central post office facilities who handle bulk mail.

To begin, place one pallet (slat-side up) on level ground. This pallet is the bottom of your bin and will allow for good drainage and aeration by keeping yard trimmings above the ground. Properly drained and aerated compost decomposes quickly and without odors.

Arrange the remaining pallets upright around each side of the base to form a box, short (40") sides up. Use spare wire, coathangers, or nylon rope to fasten the pallets together. Join pallets at each corner, lashing both the top and bottom. You can gain access to your compost pile by unfastening one side of a pallet and swinging it out like a hinged door.

Multi-Bin Units

Large properties and institutions like schools and churches may require a larger compost bin system to accommodate their materials. And gardeners looking for quick compost may prefer a multi-bin system to make turning materials easier.

First, construct a single bin as described above. Then expand your compost system by setting another pallet to the right of the base of your existing bin, and adjoining it. Form another box with three additional pallets to form the door and sides of the new bin. The two bins will share one side. Additional "bins" can be added-on using just four pallets at a time.

Two-bin systems allow easy turning of materials by transferring decomposing trimmings from one side to the other. Three-bin systems are favored by aggressive composters, with one bin used for newer materials, which are "turned" or transferred into the second bin after several weeks (or months), and later into the final "curing" bin for several weeks or months, prior to use. Churches and schools frequently construct three, four, or more bin systems to handle materials.

Lifespan and Maintenance

Pallet bin sides generally last from four to six years, depending on the level of active use. Bases last one to two years and need to be replaced. Just drop another fresh pallet over the old base after removing any compost still in the bin -- keep the new base as level as possible. The decomposing pallet will eventually turn to compost. Check corner lashing periodically and replace every several years, or as needed.

Piles and Pallets and Bins

Some composters prefer to use a free standing pile or "heap." Even this simple method of composting can be enhanced by using pallets to improve drainage and aeration. Use a pallet as the base of your compost "heap," rather than the layer of twigs or brush that are traditionally recommended. This smooth, even base will permit materials to be turned much more easily.

To create a pallet base, use a pallet with narrow 1/2" spaces between slats. If a pallet with narrow spaces is not available, try stapling or tacking a layer of hardware cloth to the top of the pallet to keep material from falling through the spaces. Two adjacent pallets on the ground create a handy work area for easy turning.

Homeowners who already have one of many commercially available compost bins can also improve good drainage and aeration. Simply set your open-base bin atop a wooden pallet. A layer of brush is now no longer required, thereby expanding you prefabricated unit's capacity.

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About the GreenMan

I have been an environmental program director and educator for the past 25 years. I am also a writer, editor, columnist, and publisher, sometime producer, and off-and-on radio and cable television host.

The GreenMan? Beyond my educational background in Medieval Studies, and my personal interest in the image and myth of the "Green Man," I’ve taken on the term as a colorful bit of “branding” for my televised GreenMan Show and my long-running GreenMan newspaper column, which inspired many of the posts you find here.